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Red Stripe Disease

Red Stripe Disease

Gonatophragmium sp.

fungi

In a Nutshell

    Initially, pin-sized, yellowish green to light orange spots at the leaf baseAs leaves grow, red streaks or stripes stretch from these spots towards the leaf tipUsually only one or two such stripes per leaf

Hosts: %1$s

· Rice

Symptoms

The disease usually occurs when the plants reach the reproductive stage, starting from panicle initiation. Initially, leaf lesions appear as pin-sized spots of light yellowish green to light orange color at the base of the leaf blade. As the disease develops, the lesion extend along the sheath towards the leaf tip, forming red streaks and stripes. Lesions may become necrotic and coalesce, giving the leaf a blight appearance. The symptoms can be confused with orange leaf blight disease and are almost indistinguishable from the bacterial leaf blight disease at severe stages. However, in red stripe, there is usually one or two such lesions per leaf and they display a characteristic orange spot with a stripe stretching towards the tip of the leaf.

Trigger

The symptoms are believed to be caused by fungus of the genus Gonatophragmium. Even though it may be present on the plant since the early seedling stage, the symptoms usually start to develop when the plants reach the reproductive stage, starting from panicle initiation. Environmental factors such as high temperature, high relative humidity, high leaf wetness, and high nitrogen supply favor disease development. It is believed that the pathogen enters plant tissue and produces toxins that are carried toward the tip of the leaf by the veins, thereby the formation of the typical stripe. Red stripe is a potential threat to rice production in Southeast Asia and India.

Biological Control

No biological control is available at the moment. Please notify us, if you know of any.

Chemical Control

Always consider an integrated approach with preventive measures together with biological treatments if available. Sprays containing benomyl, carbendazim, and thiophanate methyl can effectively control the disease.

Preventive Measures

    Grow resistant varieties, if available in your areaEnsure sufficient space between plants and optimal seeding rateRegularly monitor the field for signs of the disease symptomsDo not over-fertilize with nitrogenDuring panicle initiation, an intermittent drainage could avoid the development of the disease